Question

Unity 5.6.0b1发布后，

MovieTexture最终被弃用，现在已发布在桌面和移动设备上播放视频的新API。

如果需要，

VideoPlayer和VideoClip可用于播放视频并检索每个帧的纹理。

我已经设法让视频正常工作，但是却没有从Windows 10的编辑器那里得到音频。任何人都知道为什么没有播放音频？

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Answer 1

发现问题。以下是播放视频和音频的 FIXED 代码：

//Raw Image to Show Video Images [Assign from the Editor]
public RawImage image;
//Video To Play [Assign from the Editor]
public VideoClip videoToPlay;

private VideoPlayer videoPlayer;
private VideoSource videoSource;

//Audio
private AudioSource audioSource;

// Use this for initialization
void Start()
{
    Application.runInBackground = true;
    StartCoroutine(playVideo());
}

IEnumerator playVideo()
{
    //Add VideoPlayer to the GameObject
    videoPlayer = gameObject.AddComponent<VideoPlayer>();

    //Add AudioSource
    audioSource = gameObject.AddComponent<AudioSource>();

    //Disable Play on Awake for both Video and Audio
    videoPlayer.playOnAwake = false;
    audioSource.playOnAwake = false;

    //We want to play from video clip not from url
    videoPlayer.source = VideoSource.VideoClip;

    //Set Audio Output to AudioSource
    videoPlayer.audioOutputMode = VideoAudioOutputMode.AudioSource;

    //Assign the Audio from Video to AudioSource to be played
    videoPlayer.EnableAudioTrack(0, true);
    videoPlayer.SetTargetAudioSource(0, audioSource);

    //Set video To Play then prepare Audio to prevent Buffering
    videoPlayer.clip = videoToPlay;
    videoPlayer.Prepare();

    //Wait until video is prepared
    while (!videoPlayer.isPrepared)
    {
        Debug.Log("Preparing Video");
        yield return null;
    }

    Debug.Log("Done Preparing Video");

    //Assign the Texture from Video to RawImage to be displayed
    image.texture = videoPlayer.texture;

    //Play Video
    videoPlayer.Play();

    //Play Sound
    audioSource.Play();

    Debug.Log("Playing Video");
    while (videoPlayer.isPlaying)
    {
        Debug.LogWarning("Video Time: " + Mathf.FloorToInt((float)videoPlayer.time));
        yield return null;
    }

    Debug.Log("Done Playing Video");
}

为什么没有播放音频

//Set Audio Output to AudioSource
videoPlayer.audioOutputMode = VideoAudioOutputMode.AudioSource;

//Assign the Audio from Video to AudioSource to be played
videoPlayer.EnableAudioTrack(0, true);
videoPlayer.SetTargetAudioSource(0, audioSource);

必须在videoPlayer.Prepare();之前调用

而不是之后。这需要数小时的实验才能发现这是我遇到的问题。

坚持“准备视频”？

在调用videoPlayer.Prepare();后等待5秒钟然后退出while循环。

替换：

while (!videoPlayer.isPrepared)
{
    Debug.Log("Preparing Video");
    yield return null;
}

使用：

//Wait until video is prepared
WaitForSeconds waitTime = new WaitForSeconds(5);
while (!videoPlayer.isPrepared)
{
    Debug.Log("Preparing Video");
    //Prepare/Wait for 5 sceonds only
    yield return waitTime;
    //Break out of the while loop after 5 seconds wait
    break;
}

这应该可以，但是当视频开始播放时您可能会遇到缓冲。在使用这个临时修复时，我的建议是提交标题为“videoPlayer.isPrepared always true”的bug，因为这是一个错误。

有些people也通过更改：

来修复它

videoPlayer.playOnAwake = false; 
audioSource.playOnAwake = false;

到

videoPlayer.playOnAwake = true; 
audioSource.playOnAwake = true;

从网址播放视频：

替换：

//We want to play from video clip not from url
videoPlayer.source = VideoSource.VideoClip;

使用：

//We want to play from url
videoPlayer.source = VideoSource.Url;
videoPlayer.url = "http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4";

然后删除：

public VideoClip videoToPlay;和videoPlayer.clip = videoToPlay;因为不再需要这些。

从StreamingAssets文件夹播放视频：

string url = "file://" + Application.streamingAssetsPath + "/" + "VideoName.mp4";

if !UNITY_EDITOR && UNITY_ANDROID
    url = Application.streamingAssetsPath + "/" + "VideoName.mp4";
#endif

//We want to play from url
videoPlayer.source = VideoSource.Url;
videoPlayer.url = url;

所有支持的视频格式：

OGV
VP8
WEBM
MOV
DV
MP4
M4V
MPG
MPEG

Windows上额外支持的视频格式：

AVI
ASF
WMF

其中一些格式在某些平台上不起作用。有关支持的视频格式的详情，请参阅this帖子。

Answer 2

与其他答案一样。您可以在准备和结束视频状态时使用回调。而不是使用协同程序和收益率。

videoPlayer.loopPointReached += EndReached;
videoPlayer.prepareCompleted += PrepareCompleted;

void PrepareCompleted(VideoPlayer vp) {
    vp.Play();
}

void EndReached(VideoPlayer vp) {
    // do something
}

Answer 3

我使用@Programmer的答案从URL播放视频，但无法播放任何声音。最终，我在the comments of a YouTube tutorial.

中找到了答案

要使音频播放通过URL加载的电影，您需要在调用EnableAudioTrack之前添加以下行：

videoPlayer.controlledAudioTrackCount = 1;

Answer 4

到目前为止，VideoPlayer应该更新，你不需要编写代码才能正常工作。以下是我发现具有最佳效果的设置：

这些设置是：

视频播放器：

Play On Awake： True
等待第一帧：错误
音频输出模式：无

音频来源：

Play On Awake： True

不要忘记为VideoPlayer设置VideoClip，为AudioSource设置AudioClip。我发现效果最好的文件格式是视频的.ogv和音频的.wav。

使用新的Unity VideoPlayer和VideoClip API播放视频

4 个答案: